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therm
therm-
therm.
thermae
thermal
thermal barrier
thermal conductivity
thermal cracking
thermal efficiency
thermal equilibrium
thermal imaging
thermal neutron
thermal noise
thermal pollution
thermal printer
thermal reactor
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thermal efficiency
ther·mal ef·fi·cien·cy (plural ther·mal ef·fi·cien·cies)


noun 
Definition:
 
ratio of work to energy supplied: the work done by a heat engine divided by the thermal energy required to operate it
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